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  • Question
  • The product of two numbers is 192 and the sum of these two numbers is 28. What is the smaller of these two numbers?


  • Options
  • A. 16
  • B. 14
  • C. 12
  • D. 18

  • Correct Answer
  • 12 

    Explanation

    Let the two numbers be x and y .
    According to question,
    ? xy = 192...................... (1)
    x + y = 28........................(2)
    As we know that,
    (x - y)2 = (x + y)2 - 4xy
    Put the value of xy and x + y from equation (1) and (2), we will get
    (x - y)2 = (28)2 - 4 x 192
    ? (x - y)2 = 784 - 786
    ? (x - y)2 = 16
    ? x - y = 4......................(3)
    Add the equation (2) and (3), we will get
    x + y + x - y = 28 + 4
    2x = 32
    x = 16
    Put the value of x in equation (2), we will get
    16 + y = 26
    y = 28 - 16
    y = 12

    So numbers are x = 16 and y = 12.
    Smaller number is 12.



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